Electric mount



Jan. 19, 1960 13, w, comms, JR 2,922,138

ELECTRIC MOUNT Filed May 3, 1956 CEMENT lN PQOS/T/ON Iiflezvior fiamforzii W wzww J9:

nited States Patent ELECTRIC MOUNT Danforth W. Comins, Jr., Concord,Mass., assignor to Cambridge Thermionic Corporation, Cambridge, Mass., acorporation of Massachusetts Application May 3, 1956, Serial No. 582,435

2 Claims. (Cl. 339-147) This invention relates to mounts for electricalimpedance means such as adjustable inductors or capacitors.

Objects of the invention are to provide devices of the above type whichare especially suited for miniaturizing and for mounting on printedcircuit panels to which they can be mechanically and electricallysecured by dip soldering, to provide coil forms which are easilyadaptable for various purposes and permit the mounting of an adjustablecore, to provide devices of this type which can be easily and yetaccurately and reliably assembled from prefabricated simple andinexpensive components, to provide coil forms which can be directlymounted as indicated above without requiring any special mountingcomponents, and to provide devices of this type which are light, ruggedin use and solidly constructed, but nevertheless inexpensive, and whichare exceptionally strong and electrically and mechanically efficient,while requiring a minimum amount of molding, machining, and assemblingoperations.

Briefly stated by way of a summary indicating its nature and substance,devices according to the invention comprise a ring shaped collaralthough not necessarily toroidal, or annulus made of insulatingmaterial; a plurality of metal lugs which contact the inside of thecollar which can have notches for that purpose, and have at one end aprong that extends radially thereof and at the other end a prong thatextends essentially parallel to the axis of the collar; and a tubularinsulating body, serving for example as a coil form, which at one endcontacts with its outside, the inside of the terminal lugs. The lugs arepreferably fastened to the collar by means of portions which are bentaround the collar preferably within the above mentioned notches on theinside of the collar, and the insulating tube is forced into the insideof the collar and the lugs and preferably cemented in position. Animpedance means such as a coil or an electrode can be mounted on theoutside of the tube and an adjustable element such as an iron core or asecond electrode can be adjustably mounted in the inside of the tube.The impedance component can be electrically connected to the radiallyextending lugs whereas the device as a whole can be mounted andelectrically connected by means of the axially extending lugs forexample by inserting them into perforations of a printed circuit boardand fastening them thereto by way of dip soldering.

These and other objects and aspects of novelty of the invention willappear from the following description of a typical embodiment thereofillustrating its novel characteristics. This description refers to adrawing in which Fig. 1 is a top elevation of an embodiment of theinvention in the form of a coil form assembly;

Fig. 2 is a side elevation, partly in axial section, of the assemblyaccording to Fig. 1;

Fig. 3 is an elevation of the annulus or collar which forms a base forthe assembly according to the invention, also showing a section on lines33 of Fig. 2 of one lug;

Fig. 4 is an axial section through the collar according to Fig. 3, andan elevation of lugs applied thereto, with ice tion, through thecompleted assembly, indicating the mounting thereof on a printed circuitboard.

The components of devices according to the invention are held togetherby a collar or annulus 11 which is made of insulating material such as aglass silicon or phenolic resin and which is generally speaking ofrectangular cross section as shown in Figs. 2, 4, and 5, and which, in apreferredembodiment, has on its inside a number of notches for terminallugs, indicated at 12.1, 12.2, 12.3, and 12.4 of Fig. 3. According torequirements, two or more notches are applied; in the present instancefour such notches for terminal lugs are shown, but it will be understoodthat any desirable number can be used that can be accommodated, and thatit does not necessarily have to be an even number.

The terminal lugs are initially made in the shape indicated at 15 ofFig. 4. Each lug has an axial prong 15.1, a shorter radial terminalprong 15.2, a rectangularly offset mounting portion 15.3 and a mountingtip 15.4 which extends at right angles from the prong 15.2 and isinitially so dimensioned that the lug can be inserted in one of thenotches 12.1 to 12.4 as indicated on the left-hand side of Fig. 3. Thetip 154 is formed by angularly cutting out and bending a portion fromthe radial prong 15.2, thus leaving therein a recess 15.6 which alsofacilitates the soldering thereto of a wire. As shown in Fig. 2, thelonger, axially depending prongs 15.1 have notches 15.7 and 15.8,serving similar purposes. After the lug portions 15.3 have been insertedin the notches 12.1 to 12.4 as shown at the left-hand side of Fig. 3,the arms 15.2 are bent such that the tips 15.4 engage the outer side ofthe collar 11, as indicated at 15.9 on the right-hand side of Figs. 2, 4and 5. The lugs are now fastened to the collar so that this intermediateassembly can be easily handled.

After the lugs -15 have been applied to the collar 11 in this manner,the tube 17, for example a ceramic or spirally wrapped phenolic tube,with a thread 17.1 applied to its inside, is inserted with an end intothe collar 11 and the lugs 15. As indicated in Fig. 2, the tube 17 isthen cemented in position within the collar 11 and the lugs 15, thecement further securing the prongs as well as the tube to the collar 11.

As indicated in Fig. 2 at 17.1, the tube 17 has an inside threadembossed thereinto and this thread carries a tuning slug 17.2 whoseposition within the tube can be adjusted such as by means of ascrewdriver slot 17.3. On the outside of the tube 17 is indicated a coil17.5 constituting an inductance element. As indicated in Fig. 5, theends 17.6 of the coil 17 .5 can be brought towards and fastened such asby soldering to the radial prongs 15.9.

It should be understood that the present invention is not restricted toinductors of the type above described but could for example be adaptedto capacitor devices with one plate on the outside and a secondadjustable one on the inside of the tube 17.

Fig. 5 indicates the mounting of devices of this type on a printedcircuit board indicated at b of Fig. 5 and carrying a printed metalliccircuit indicated at p. The axially depending prongs 15 are insertedthrough holes of the panel, indicated at 18 of board b and the lugs orprongs 15 are then electrically and mechanically connected to theprinted circuit p by means of dip soldering in well known conventionalmanner.

It should be understood that the present disclosure is for the purposeof illustration only and that this invention includes all modificationsand equivalents which fall within the scope of the appended claims.

I claim:

1. A device for mounting electric impedance means,

comprising: a ring made of insulating material having a first and asecond transverse end face respectively, inner and outer longitudinalsurfaces, and longitudinal notches V transverse end face of the ring;and a tubular insulating form having a straight and smooth peripheralsurface and a transverse end which conforms to the cross section of theform, the form extending with said transverse end into said ring withsaid peripheral surface substantially flush with said longitudinallyextending portions of the lugs within'the ring notches and with saidinner longi tudinal surface of the ring between the notches, and withsaid transverse end substantially flush with said first prongs wherethey extend radially on said first transverse end face of the ring;whereby said lugs are secured be tween the ring and the form.

2. A device for mounting electric impedance means, comprising: a ringmade of insulating material having a first and a second transverse endface respectively, inner and outer longitudinal surfaces, andlongitudinal notches in said inner longitudinal surface; a plurality ofmetal lugs having portions extending longitudinally within said notcheson said inner longitudinal surface and having first prongs extendingradially on said first transverse end face of said ring and from therelongitudinally in the direction of said outer longitudinal surface ofthe ring to form fastening and terminal members, and the lugs havingadditional prongs extending radially on said second transverse end faceof the ring and havingsplit ends with one part bent to engage said outerlongitudinal-surface of the ring and with another part extendingradially from the ring to form a terminal member; and a tubularinsulating form having a straight and smooth peripheral surface and atransverse end which conforms to the cross section of the form, the formextending with said transverse end into said ring with said peripheralsurface substantially flush with said longitudinally extending portionsof the lugs within the ring notches and with said inner longitudinalsurface of the ring between the notches, and with said transverse endsubstantially flush with said first prongs where they extend radially onsaid first transverse end face of the ring; whereby said lugs aresecured between the ring and the form.

References Cited in the file of this patent UNITED STATES PATENTS1,823,827 Franz Sept. 15, 1931 FOREIGN PATENTS 9,294/ 32 Australia Sept.20, 1932 639,824 Germany Dec. 18, 1936

